Get non proxy method for StackDumpVisitor

Fixes failing DCHECK.

Bug: 22553459
Change-Id: I6fe1012f9a5f8d29cb98bf25e3a279da51c5e1c0

runtime/thread.cc

@@ -1180,6 +1180,7 @@ struct StackDumpVisitor : public StackVisitor {
     if (m->IsRuntimeMethod()) {
       return true;
     }
+    m = m->GetInterfaceMethodIfProxy(sizeof(void*));
     const int kMaxRepetition = 3;
     mirror::Class* c = m->GetDeclaringClass();
     mirror::DexCache* dex_cache = c->GetDexCache();